Jig employed in the construction of electrodes



Dec. 18 1923.

' R. F. TRIMBLE' JIG EMIfLOYED IN THE CONSTRUCT T ON OF ELECTRODES Filed April 6 v1920 3 2 LI'IIIIII! All RUSSELL F. TRIll/ZBLE. OF ELIZABETH, NEW JERSEY. ASSIGNOR TO WESTERN ELldi TRIO COMPANY, INCORPORATED, 0F NEVT YORK, l l. LA CORPORATIQN OF NEW YORK.

J'IC-i EMPLOYED IN THE CONSTEUCTTON 03E ELECTRUDES.

Qriginal application filed November 2, 1918, Serial W0. 261,630. lDivided and this application filed'April 16,1920. Serial No. 374,419.

1 0 01 Z "whom it may concerh Be it known that l, RUSSELL F. TRIMBLE,

a citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Jigs Employed in the Construction of Electrodes, of which the following is a full, clear, concise, and exact description.

The invention relatesto electrode structure-s which may be employed. in an electrical discharge device such as a thermionic device of the audion type.

One type of audion employs a filamentary cathode, a grid at each side of the cathode and a plate or anode surface adjacent each grid. The two grid electrodes, and the same is true of the two plate electrodes, are electrically connected together inside or outside of the evacuated container.- A stronger and more compact arrangement of the double electrodes is provided according to the-present invention, wherein the double electrode is provided in the form of a unitary structure. This has been applied to the manu facture of the grid or screen electrode which specifically is composed of twoparal'el U shaped side wires, parallel cross wires extending from one U to the other-and at right angles thereto. .This grid is claimed and described in application Serial No. 261,030,

filed November 2, 1918, for electrodes andtheir construction, of which this is a division.

Another feature of the invention resides in the manufacture of double electrodes. This feature is described and-claimed in application Serial No. 374,418,"filed April 16, 1920, which is a division of application Serial No. 261,030, filed November 2, 1918, for electrodes and their construction. This grid is made by providing an extended electrode surface which is bent'upon itself in such a fashion as to provide the desired number of electrode surfaces.

A jig, which comprises the feature of this invention. is made use of in the manufac* ture of the grid electrode. This jig may be employed for making not only single grid electrodes, but it is particularly useful in the manufacture of a plurality of double grids, all of which may be made practically at the same time and in one continuous mechanical operation. On each of a plurality of flat faces are laid parallel wires which are to form the sides of the grid. The cross wires are formed by winding a wire across the side wires, the intersections being welded or otherwise fastened. The resulting composite structure is divided to form the required plurality of electrode surfaces.

Referring to the drawings for further details of the invention, Fig. 1 discloses in perspective a jig that may be employed in the manufacture of the electrode.

Figs. 2, 3 and 4 illustrate a grid electrode in various stages of its manufacture.

Fig.- 5 illustrates diagrammatically a lathe that may be employed for revolving the jig one of the side wires in the grid. This wire 6 is continued across the face 2 as illustrated in dotted lines. .A similar side wire 7 a"'s'oprovided and is continued across both faces of the jig. The wires 6 and 7 may be held in the position shown byhaving their ends twisted or in any other suitable manner. Each edge of each face of the jig is provided with grooves 8 which are adapted to receive the wire 9 which is wound around the jig and across both faces thereof to provide the cross wires f the grid. The wind ing process may be performed by hand or preferably the jig is supported in a lathe Such as conventionally represented in Fig. 5, in order that it may be rotated while the wire 9 is wound thereupon. It will be noted that the wire 9 in passing from the front grooved edge of the, lower face to the front grooved edge of the upper face is ofiset, a similar offset being f nnecessary at the other edge. This makes it possible for the wire 9 to cross always at right angles to the side wires 6.

After the wire 9 has been wound upon the side. wires as shown, the wires where they '3 and rovided in order that room may be had for orming the arch 11 which integrally connects the two grid surfaces as shown in Figs. 4. The reinforcing wires shown at 34:,35, 36 and 37 Fig. 2 may be cut to approximately -the proper length, laid across theside-Wires 6 and 7 Fig. and welded thereto, while the wires 6, 7, 34:, 35, 36 and 37 are shown heavier than the cross wire 9, these may all be of the same size or the cross wires 9 may wires. and side wires have been welded a suitable cutting tool, such as a pair of scissors, may be passed along a groove 12 and a similar groove 1.3 at the other edge of the jig in order to cut the wire 9 along these grooves. The side wires 6 and 7 are also'cut at the ends of the jig.- This releases two double grid surfaces somewhat of the form shown in Fig. 2.' After trimming the ends of the cross wires 9, which project beyond the side wiresfi and 7 the resulting electrode may be suitably bent into the shape shown in Fig. 3 and for the purpose the machine shown in my said copending application Serial No. 37 11218 maybe employed. T 6 further strengthen the projecting end 28 of the be welded to the adjacent the grid structure side wire 6 may as shown at 80 in Fig. 4. The other two projecting ends of lZhB SlClB wire 7 may be similarly welded.

It will be apparent that the grid electrode shown in Fig. 4: is a rigid compact structure,

the side wires of which are U shaped, the cross wires extending from the legof one U to the corresponding leg of the other U.

The electrode shown in Fig.4, is particularly adaptedto be employed as a double grid electrode in a'device of the audion type as shown in my said copending application Serial No. 261,030, wherein the grid electrode has one surface located between the cathode and one plate of the double anode and the other grid surface extending bebe larger than the other After the intersections'of the cross projecting end 29 mg adapted to receive tween the cathode and the other plate of the anode.

What is claimed is:

1. A jig comprising front and back plane faces each adaptedt receive longitudinally extending wires, the edges of said faces beingserrated in planes perpendicular to said wires, and a groove between adjacent sei rated edges.

2. A jig comprising a member having smooth faces, each of said faces being adapted to'receive longitudinally extending wires, and means on said jig for positioning the convolutions of a wire wound across said longitudinally extending wires at right angles thereto.

' 3. A. jig comprising a: member having plane faces, each of said members being adapted to receive longitudinally extending wires, each of said faces having notches in its edges for positioning the convolutionsof a wire wound extending wires at right angles thereto.

4. A jig comprising a member having opposed parallel' smooth faces, each of said faces being adapted to receive longitudinally extending wires, the edges of each of said faces being notched for positioning the convolutions of a wire to be wound across said longitudinally extending wires, being so disposed that said wire crosses sa1d lon itudinally extending wires substantially at rightangles. e

5. A jig comprising a member having lane parallel faces, each of said faces belongitudinally extending wires, the edges of each of said faces being notched for positioning substan tially atv right angles to said longitudinally extending Wiresthe convolutions of a wire to be wound across said longitudinally-extending wires. ,I

In witness whereof, I hereunto subscribe my name this 14th RUSSELL l5. TRTMBLE.

across said longitudinally said notches day of April A. D, 1920. 

